The 12 Days of Winterval achievement for Worms: Reloaded reads
deal exactly 12 damage to a worm with 100 health. What weapon can I use in order to accomplish this?
Try the Uzi. It does 1 damage per hit, so if you control where you aim, you can do just 12 damage to the enemy worm.
Alternatively, you can use Teleport/Jetpack to get 12 fall damage.
Just set up a custom game with 4 human teams. You should get it in a few minutes.
I used a custom map I found. It worked very well.
Just walk off the high ledge to do exactly 12 fall damage to your worm.
No credit to me, I just found this solution elsewhere and reposted!